Opening up the nasal airway through proper use of palatal expansion has shown to help widen nasal cavities. It must be done right, though... or it can even choke them off. If done with the far back molars alone... it can actually angle the nose smaller. I hypothesize this is why many who combine with tongue exercises get better results. Probably just better to support the anterior maxilla through RPE design.
https://wholenewmom.com/health-concerns/chronic-sinusitis-treatment-orthodontia-expander/
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